From e2d26d506cfaff9420c9071f436afd1ac917de57 Mon Sep 17 00:00:00 2001
From: Jeff Emmett <jeffemmett@gmail.com>
Date: Thu, 12 Mar 2026 20:19:56 -0700
Subject: [PATCH] feat(rwallet): add 5 more testnet chains for EVM balance
 scanning

Adds Arbitrum Sepolia, Optimism Sepolia, Polygon Amoy, Avalanche Fuji,
and BSC Testnet with RPC URLs, native tokens, popular ERC-20s, and
Alchemy slug mappings.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 .../rwallet/components/folk-wallet-viewer.ts  |  5 +++
 modules/rwallet/mod.ts                        | 37 +++++++++++++++++--
 2 files changed, 39 insertions(+), 3 deletions(-)

diff --git a/modules/rwallet/components/folk-wallet-viewer.ts b/modules/rwallet/components/folk-wallet-viewer.ts
index b3753c3..02cd821 100644
--- a/modules/rwallet/components/folk-wallet-viewer.ts
+++ b/modules/rwallet/components/folk-wallet-viewer.ts
@@ -61,6 +61,11 @@ const CHAIN_COLORS: Record<string, string> = {
 	"324": "#8c8dfc",
 	"11155111": "#f59e0b",
 	"84532": "#f59e0b",
+	"421614": "#9ca3af",
+	"11155420": "#ff6680",
+	"80002": "#a855f7",
+	"43113": "#fb923c",
+	"97": "#fbbf24",
 };
 
 const CHAIN_NAMES: Record<string, string> = {
diff --git a/modules/rwallet/mod.ts b/modules/rwallet/mod.ts
index f9f5ee1..df2b1bd 100644
--- a/modules/rwallet/mod.ts
+++ b/modules/rwallet/mod.ts
@@ -121,9 +121,14 @@ const CHAIN_MAP: Record<string, { name: string; prefix: string }> = {
 	"324": { name: "zkSync", prefix: "zksync" },
 	"11155111": { name: "Sepolia", prefix: "sep" },
 	"84532": { name: "Base Sepolia", prefix: "basesep" },
+	"421614": { name: "Arbitrum Sepolia", prefix: "arbsep" },
+	"11155420": { name: "Optimism Sepolia", prefix: "optsep" },
+	"80002": { name: "Polygon Amoy", prefix: "polyamoy" },
+	"43113": { name: "Avalanche Fuji", prefix: "avaxfuji" },
+	"97": { name: "BSC Testnet", prefix: "bsctest" },
 };
 
-const TESTNET_CHAIN_IDS = new Set(["11155111", "84532"]);
+const TESTNET_CHAIN_IDS = new Set(["11155111", "84532", "421614", "11155420", "80002", "43113", "97"]);
 
 function getChains(includeTestnets: boolean): [string, { name: string; prefix: string }][] {
 	return Object.entries(CHAIN_MAP).filter(([id]) => includeTestnets || !TESTNET_CHAIN_IDS.has(id));
@@ -151,6 +156,11 @@ const DEFAULT_RPC_URLS: Record<string, string> = {
 	"324": "https://mainnet.era.zksync.io",
 	"11155111": "https://rpc.sepolia.org",
 	"84532": "https://sepolia.base.org",
+	"421614": "https://sepolia-rollup.arbitrum.io/rpc",
+	"11155420": "https://sepolia.optimism.io",
+	"80002": "https://rpc-amoy.polygon.technology",
+	"43113": "https://api.avax-test.network/ext/bc/C/rpc",
+	"97": "https://data-seed-prebsc-1-s1.binance.org:8545",
 };
 
 // Chain ID → env var name fragment + Alchemy subdomain (for auto-construct)
@@ -165,8 +175,13 @@ const CHAIN_ENV_NAMES: Record<string, { envName: string; alchemySlug?: string }>
 	"43114": { envName: "AVALANCHE" },
 	"56":    { envName: "BSC" },
 	"324":   { envName: "ZKSYNC" },
-	"11155111": { envName: "SEPOLIA" },
-	"84532": { envName: "BASE_SEPOLIA" },
+	"11155111": { envName: "SEPOLIA",         alchemySlug: "eth-sepolia" },
+	"84532":    { envName: "BASE_SEPOLIA",    alchemySlug: "base-sepolia" },
+	"421614":   { envName: "ARB_SEPOLIA",     alchemySlug: "arb-sepolia" },
+	"11155420": { envName: "OPT_SEPOLIA",     alchemySlug: "opt-sepolia" },
+	"80002":    { envName: "POLYGON_AMOY",    alchemySlug: "polygon-amoy" },
+	"43113":    { envName: "AVAX_FUJI" },
+	"97":       { envName: "BSC_TESTNET" },
 };
 
 /**
@@ -204,6 +219,11 @@ const NATIVE_TOKENS: Record<string, { name: string; symbol: string; decimals: nu
 	"324": { name: "Ether", symbol: "ETH", decimals: 18 },
 	"11155111": { name: "Sepolia ETH", symbol: "ETH", decimals: 18 },
 	"84532": { name: "Base Sepolia ETH", symbol: "ETH", decimals: 18 },
+	"421614": { name: "Arb Sepolia ETH", symbol: "ETH", decimals: 18 },
+	"11155420": { name: "OP Sepolia ETH", symbol: "ETH", decimals: 18 },
+	"80002": { name: "Amoy POL", symbol: "POL", decimals: 18 },
+	"43113": { name: "Fuji AVAX", symbol: "AVAX", decimals: 18 },
+	"97": { name: "Test BNB", symbol: "tBNB", decimals: 18 },
 };
 
 async function rpcCall(rpcUrl: string, method: string, params: any[]): Promise<any> {
@@ -440,6 +460,17 @@ const POPULAR_TOKENS: Record<string, Array<{ address: string; name: string; symb
 	"84532": [
 		{ address: "0x036CbD53842c5426634e7929541eC2318f3dCF7e", name: "USD Coin", symbol: "USDC", decimals: 6 },
 	],
+	"421614": [
+		{ address: "0x75faf114eafb1BDbe2F0316DF893fd58CE46AA4d", name: "USD Coin", symbol: "USDC", decimals: 6 },
+		{ address: "0x980B62Da83eFf3D4576C647993b0c1D7faf17c73", name: "Wrapped Ether", symbol: "WETH", decimals: 18 },
+	],
+	"11155420": [
+		{ address: "0x5fd84259d66Cd46123540766Be93DFE6D43130D7", name: "USD Coin", symbol: "USDC", decimals: 6 },
+		{ address: "0x4200000000000000000000000000000000000006", name: "Wrapped Ether", symbol: "WETH", decimals: 18 },
+	],
+	"80002": [
+		{ address: "0x41E94Eb019C0762f9Bfcf9Fb1E58725BfB0e7582", name: "USD Coin", symbol: "USDC", decimals: 6 },
+	],
 };
 
 // ERC-20 balanceOf(address) — selector 0x70a08231